New (August 2018) Rae Dunn Ceramic “Gulp” Coffee Mug from Marshall’s: 108 +/- 18 ppm Lead (safe by all standards)
Vintage Ceramic Hull Brand (Made In USA) Coffee Cup: 299,800 ppm [30%!] Lead (when tested with an XRF instrument.)
2017 Starbucks Coffee “You Are Here” Collection, California Mug: 6,397 ppm Lead [> 90 is unsafe for kids.]
“Made in Poland” Yellow Enamelware Mug: 88 ppm Lead + 21,600 ppm Cadmium [75 ppm Cadmium is illegal in modern items in Denmark.]
Portmeirion coffee mug with heart pattern design: 49,000 ppm Lead. For context, 90 ppm is unsafe for kids.